IMHE OpenIR  > 山地灾害与地表过程重点实验室
Alternative TitleHazard assessment of debris flow in Bailong River Basin
李淑松1; 邹强2; 陈容2; 唐建喜1
Source Publication中国水土保持科学
Contribution Rank2
Other Abstract[Background] Debris flow is a widely distributed geological hazard in the mountainous area, and the hazard assessment of debris flow is essential for its prediction, risk evaluation and prevention. The Wenchuan earthquake has disturbed the geological condition of southern Gansu province,which not only produced abundant loose material to new debris flow formation but also triggered the recurrences of some debris flows in idle. The Bailong River Basin is located in the South Gansu province, where severe debris flow occurred during the Wenchuan earthquake in 2008,thus it was selected for this study. [Methods] A watershed unit was taken as the evaluation unit, and the evaluation unit was determined using GIS technology with digital elevation model (DEM) data. A debris flow hazard assessment model at watershed-scale was proposed based on the gradient of debris flow gully,the scale of debris flow and the level of potential river blockage. By applying the proposed hazard assessment model for Bailong River Basin,the hazard degree of debris flow was obtained as 5 levels of very high,high,moderate,low,and very low, and a hazard map of debris flows was constructed for Bailong River Basin. [Results] The assessment results indicated that there were 2 debris flows at very low hazardous level, accounting for 1.3% of the total debris flows, 31 debris flows (20.7%) at low level, 60 debris flows (40%) at moderate level, 19 debris flows (12.7%) at high level, and 38 debris flows (25.3%) at very high level. The 117 debris flow gullies were at the moderate hazardous level or above, accounting for 78% of 150 total gullies. Validated by the field investigation and historical debris flow events, the debris flows in Luojiayu,Sanyanyu,Yuzi,liangshui and Shimen gullies were at very high hazardous level,which was consistent with the assessment result. [Conclusions] It is scientific to take a watershed unit as evaluation unit because it can reflect the features of valleys, topography and landform conditions when debris flow occurs. On this basis, the assessment factors are selected from the debris flow energy, source and disaster degree to establish an index system for assessing the hazard of debris flow. Through field investigations,it is confirmed that the assessment results by model are consistent with the actual situation of debris flow,thus this model may be used to predict the occurrence of debris flow in the Bailong River Basin.
Keyword泥石流 危险性评价 水文响应单元 白龙江流域
Indexed ByCSCD
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Document Type期刊论文
Corresponding Author邹强
2.中国科学院山地灾害与地表过程重点实验室/中国科学院、水利部成都山地灾害与环境研究所, 610041,成都
Corresponding Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
李淑松,邹强,陈容,等. 白龙江流域泥石流危险性评价[J]. 中国水土保持科学,2018,16(4):83-88.
APA 李淑松,邹强,陈容,&唐建喜.(2018).白龙江流域泥石流危险性评价.中国水土保持科学,16(4),83-88.
MLA 李淑松,et al."白龙江流域泥石流危险性评价".中国水土保持科学 16.4(2018):83-88.
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